Steam for Linux

Graphics Options / Color Options / Brightness, Contrast - edititing these options changes nothing (didn't try other color options). Also, I once noted a presence of HDR (very short-ranged though, almost unnoticable) but most of the time I don't see it: in dark places (e.g. the one where game starts) I had to move by touch.

By the way: maybe this is related to the fact that it offers me to install libpci.3.so on every run, no matter what I clicked (OK or Cancel) in this dialog last time. `find -name libpci.3.so` also finds nothing.